hydro/dry units

[Bec and John]

Hi,

I posted a little while ago about the hydro/dry units. I was able to 
order Schaff's last one. I'm sure it's helping at least to some degree, 
but I'd really like to test with 2 or 3 units on 1 piano.

However, I don't know anywhere to get them. Does anyone happen to know?

- John